今天在理解工厂模式时出现了一个错误:
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.qyy.factory.UserAction.main(UserAction.java:11)
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:418)
at java.util.Properties.load0(Properties.java:337)
at java.util.Properties.load(Properties.java:325)
at com.qyy.factory.getBean.<clinit>(getBean.java:16)
... 1 more
原因:读取配置文件内容时,其中的配置文件的全限定名写错,这类名字或路径最好复制全限定名,尽量不要手写,不要过分相信不会出错,哈哈
//读取配置文件内容
private static Properties pro = new Properties();
static{
//小括号的名字书写错误
InputStream is = getBean.class.getResourceAsStream("/com/qyy/beas.properties");
try {
pro.load(is);
} catch (IOException e) {
e.printStackTrace();
}
}